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programming languages Online Quiz - 297

Description: programming languages Online Quiz - 297
Number of Questions: 20
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Tags: programming languages
Attempted 0/20 Correct 0 Score 0
  1. Member Function

  2. Same name as Class name

  3. Default constructor initializes all non-initialized fields and variables to zero.

  4. Compiler adds an empty constructor, if we do not write our own constructor


Correct Option: A,B,C,D

Which is true about applet?

  1. Applet version has main method

  2. GUI components are added explicitly to the Applet

  3. Aplet class is declared private

  4. None of the above


Correct Option: D
  1. Java Foundation Course

  2. Java Fundamental Classes

  3. Java Foundation Classes

  4. None of the above


Correct Option: C

Java APIs are libraries of compiled code?

  1. True

  2. False


Correct Option: A
  1. foreach(x) System.out.println(z);

  2. for(int z : x) System.out.println(z);

  3. while( x.hasNext()) System.out.println( x.next());

  4. for( int i=0; i< x.length; i++ ) System.out.println(x[i]);


Correct Option: B,D

Given: 31. // some code here 32. try { 33. // some code here 34. } catch (SomeException se) { 35. // some code here 36. } finally { 37. // some code here 38. } Under which three circumstances will the code on line 37 be executed? (Choose three.)

  1. The code on line 31 throws an exception

  2. The code on line 33 throws an exception

  3. The code on line 35 throws an exception

  4. The code on line 33 executes successfully


Correct Option: B,C,D

Given: 10. interface Foo {} 11. class Alpha implements Foo { } 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?

  1. Alpha a = x;

  2. Foo f= (Alpha)x;

  3. Foo f= (Delta)x;

  4. Beta b = (Beta)(Alpha)x;


Correct Option: C
  1. Locale loc = Locale.getLocale();System.out.println(loc.getDisplayCountry()+ “ “+ df.format(d));

  2. Locale bc = Locale.getLocale();System.out.println(loc.getDisplayCountry()+ “ “+ df.setDateFormat(d));

  3. Locale loc = Locale.getDefault();System.out.println(loc.getDisplayCountry()+ “ “+ df.setDateFormat(d));

  4. Locale loc = Locale.getDefault(); System.out.println(loc.getDisplayCountry()+ “ “ + df.format(d));


Correct Option: D
  1. class Man { private Dog }

  2. class Man { private BestFriend dog; }

  3. class Man { private Dog bestFriend; }

  4. class Man implements Dog { }


Correct Option: C
  1. The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map

  2. Deleting a Person key from a HashMap will delete all map entries for all keys of type Person

  3. Inserting a second Person object into a HashSet will cause the first Person object to be removed as a duplicate.

  4. The time to find the value from HashMap with a Person key depends on the size of the map.


Correct Option: D

Given: 23. Object [] myObjects = { 24. new integer(12), 25. new String(”foo”), 26. new integer(5), 27. new Boolean(true) 28. }; 29. Arrays.sort(myObjects); 30. for( int i=0; i

  1. Compilation fails due to an error in line 23.

  2. Compilation fails due to an error in line 29.

  3. A ClassCastException occurs in line 29.

  4. A ClassCastException occurs in line 31.


Correct Option: C

Given: 10. package com.sun.scjp; 11. public class Geodetics { 12. public static final double DIAMETER = 12756.32; // kilometers 13. } Which two correctly access the DIAMETER member of the Geodetics class? (Choose two.)

  1. import com.sun.scjp.Geodetics;public class TerraCarta {public double halfway(){ return Geodetics.DIAMETER/2.0; } }

  2. import static com.sun.scjp.Geodetics;public class TerraCarta {public double halfway() { return DIAMETER/2.0; } }

  3. import static com.sun.scjp.Geodetics. *;public class TerraCarta {public double halfway() { return DIAMETER/2.0; } }

  4. package com.sun.scjp;public class TerraCarta {public double halfway() { return DIAMETER/2.0; } }


Correct Option: A,C

Given: 10. class Nav{ 11. public enum Direction { NORTH, SOUTH, EAST, WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } Which code, inserted at line 14, allows the Sprite class to compile?14

  1. Direction d = NORTH;

  2. Nav.Direction d = NORTH;

  3. Direction d = Direction.NORTH;

  4. Nav.Direction d = Nav.Direction.NORTH;


Correct Option: D
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